Exit DFU Mode (not recovery) without downloading anything

ok so alot of people get into dfu to downgrade or something... and they all (well most) get confused about how to exit it...
but u can exit by just holding down the home button and sleep button for like 10 secs, and itunes will recognize it normally

so im just wondering... why doesnt anyone do that instead of downloading tiny umbrella and those stuff?
am i wrong? like does it harm the device somehow or something?

Sometimes you can get into a loop where if you exit it goes back in and in and in and in. So TinyUmbrella can be used to kick it out. We all know this method, or 95% does. It was posted in a tutorial already. EOS.